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Synthesis of 1D α-MoO3/0D ZnO heterostructure nanobelts with enhanced gas sensing properties
摘要： Exploring high-performance sensing materials is ultra-important for safety control. Herein, 1D α-MoO3/0D ZnO nanocomposites are prepared via a facile hydrothermal method and its microstructure is characterized through X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive X-ray (EDX) and X-ray photoelectron spectroscopy (XPS). It is confirmed that the as-prepared nanocomposites are constituted by 1D α-MoO3 nanobelts (200-300 nm in width), with the surface loaded with fine ZnO nanoparticles. Sensing properties of the α-MoO3 and 1D α-MoO3/0D ZnO nanocomposites to ethanol are measured and compared. Interestingly, the ZnO-decorated α-MoO3 nanobelts exhibited excellent sensitivity and selectivity to ethanol at relatively low operating temperature (250 oC) when compared with that of the raw α-MoO3 nanobelts, indicating a good candidate of 1D α-MoO3/0D ZnO nanocomposites for future ethanol detection.
关键词： One-dimensional,Heterostructure,ZnO,α-MoO3 nanobelts,Ethanol sensing
更新于2025-11-14 17:04:02
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An Efficient Room Temperature Ethanol Sensor Device Based on p-n Homojunction of TiO <sub/>2</sub> Nanostructures
摘要： In this paper, an efficient room temperature ethanol sensor device based on p-n homojunction of p-TiO2 nanoparticles (NPs) and n-TiO2 nanotubes (NTs) is reported. p-TiO2 NPs were prepared by low-temperature sol–gel method and coated on n-TiO2 NTs (NPs) grown by electrochemical anodization. Field emission scanning electron microscopy and X-ray diffraction authenticated the formation of stable homojunction between p-type anatase TiO2 NPs and n-type anatase TiO2 NTs. Current–voltage characteristics of the device, in the lower voltage range (0–1.26 V) for 30 °C, followed nonlinear characteristics (Schottky). With increase in voltages (>1.26 V) and temperature (40 °C–100 °C) such nonlinear behavior moves toward more linear ones. The gas sensing performance of the homojunction device was studied at room temperature with alcohols as the test species. The device offered the maximum response magnitude of ～57% (toward ethanol) at 100 ppm with appreciably fast response time and recovery time of ～30 and ～16 s, respectively. Dramatic increase in the effective depletion region area distributed throughout the nanotubular voids and the associated localized electric filed originated from the electrostatic charge separation therein (which helps in easy dissociation of target species) is possibly responsible for such efficient room temperature sensing performance.
关键词： room temperature,Ethanol sensing,fabrication and characterization,p-TiO2 nanoparticles (NPs)/n-TiO2 nanotubes (NTs),homojunction
更新于2025-09-19 17:15:36
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Low Energy Pulsed Laser Excitation in UV Enhances the Gas Sensing Capacity of Photoluminescent ZnO Nanohybrids
摘要： Nanohybrids, composed of luminescent zinc oxide (ZnO) nanoparticles dispersed in an inert polydimethylsiloxane (PDMS) matrix, exhibit an excellent ability to follow changes in the type and composition of their surrounding atmosphere. These changes are found to affect the UV photoluminescence (PL) emission of the ZnO-PDMS hybrids measured at room temperature. The influence of irradiation parameters, such as excitation intensity and wavelength, on the response of the ZnO-PDMS sensor against ethanol and oxygen, have been systematically investigated in a comparative study performed employing pulsed excitation at 248 and 355 nm. This study represents the first demonstration that the sensing performance of the PL-based ZnO sensors can be optimized by tuning the excitation parameters and it particularly illustrates that maintaining a low pump energy density is crucial for enhancing the sensitivity of the sensor achieving response values approaching 100%.
关键词： ZnO photoluminescence,ethanol sensing,optical sensor,ZnO nanoparticles,gas sensing,oxygen sensing,ZnO-PDMS nanocomposite
更新于2025-09-12 10:27:22